Front end module with compensating duplexer
First Claim
1. A front end module comprises:
- a duplexer including;
a first winding;
a second winding, wherein the first and second windings are formed on a first thick metal layer of a substrate;
a third winding formed on at least a second thick metal layer of a substrate, wherein the first and second windings have an approximate ninety degree rotation with respect to the third winding;
first through fifth nodes, wherein;
the first node for operably coupling an antenna to the first winding;
the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding;
the third node operably couples the second winding to a balancing network;
the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and
the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding, wherein the first and second signal components are electrically isolated from the outbound wireless signal; and
a compensation module operably coupled to at least one of the first, second, and third windings and operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal; and
a balancing network operable to establish an impedance that substantially matches an impedance of the antenna.
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Accused Products
Abstract
A front end module includes a duplexer and a balancing network. The duplexer includes a compensation circuit and a transformer three windings having five nodes. The first node for operably coupling an antenna to the first winding; the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding; the third node operably couples the second winding to a balancing network; the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding. The duplexer provides electrical isolation between the first and second signal components and the outbound wireless signal. The compensation module is operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal.
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Citations
21 Claims
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1. A front end module comprises:
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a duplexer including; a first winding; a second winding, wherein the first and second windings are formed on a first thick metal layer of a substrate; a third winding formed on at least a second thick metal layer of a substrate, wherein the first and second windings have an approximate ninety degree rotation with respect to the third winding; first through fifth nodes, wherein; the first node for operably coupling an antenna to the first winding; the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding; the third node operably couples the second winding to a balancing network; the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding, wherein the first and second signal components are electrically isolated from the outbound wireless signal; and a compensation module operably coupled to at least one of the first, second, and third windings and operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal; and a balancing network operable to establish an impedance that substantially matches an impedance of the antenna. - View Dependent Claims (2, 3, 4, 5, 20, 21)
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6. A radio front end comprises:
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a power amplifier operably coupled to amplify an up-converted signal to produce an outbound wireless signal; a duplexer operably coupled to an antenna, wherein the duplexer is operable to provide electrical isolation between the outbound wireless signal and an inbound wireless signal; a balancing network operably coupled to the duplexer and operable to establish an impedance that substantially matches an impedance of the antenna; a low noise amplifier operably coupled to amplify the inbound wireless signal, wherein the low noise amplifier includes a common-mode isolation compensation circuit that compensates for degradation of common-mode isolation caused parasitic capacitance of the duplexer, the common-mode isolation compensation circuit including; a first capacitor coupled to a first input transistor; a second capacitor coupled to a second input transistor; and a common-mode degeneration inductor coupled to a return and a common node of the first and second capacitors. - View Dependent Claims (7, 8, 9, 10)
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11. A radio front end comprises:
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a power amplifier operably coupled to amplify an up-converted signal to produce an outbound wireless signal; a duplexer operably coupled to an antenna, wherein the duplexer is operable to provide electrical isolation between the outbound wireless signal and an inbound wireless signal; a balancing network operably coupled to the duplexer and operable to establish an impedance that substantially matches an impedance of the antenna; and a compensation module operable to compensate for degradation of the electrical isolation between the first and second signals and the outbound wireless signal caused by parasitic capacitance of the duplexer, the compensation module including; a first compensation capacitor coupled in parallel with a first parasitic capacitance of the duplexer; and a second compensation capacitor coupled in parallel with a second parasitic capacitance of the duplexer, wherein a sum of capacitance of the first compensation capacitor and the first parasitic capacitance substantially equals a sum of capacitance of the second compensation capacitor and the second parasitic capacitance. - View Dependent Claims (12)
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13. A front end module comprises:
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a duplexer including; a first winding; a second winding wherein the first and second windings are formed on a first two thick metal layers of a substrate; a third winding formed on a second two thick metal layers of a substrate; first through fifth nodes, wherein; the first node for operably coupling an antenna to the first winding; the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding; the third node operably couples the second winding to a balancing network; the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding, wherein the first and second signal components are electrically isolated from the outbound wireless signal; and a compensation module operably coupled to at least one of the first, second, and third windings and operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal; and a balancing network operable to establish an impedance that substantially matches an impedance of the antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification